Did you know there is an free online puzzle posted everyday at Jigsaw Explorer. It uses photos and art that have been posted on Flickr (with permission). One of my pieces will be used for the Valentine's Day puzzle! I'm so honored!
You need to have Silverlight on your PC in order to use the page, but you'll be able to download it from Jigsaw Explorer, if needed.
If you like puzzles, you should check it out.